Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors
Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors
复制标题
第十八届核电系统材料环境降解国际会议 - 水反应堆
DOI：
10.1007/978-3-319-67244-1_16
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Teng F
中科院分区：
文献类型：
--
作者：
Teng F
对于基于Ni-Cr二元系统的合金，例如合金625和690，由于等温时效引起的机械性能退化是潜在的问题。用实验方法研究了Ni-Cr模型合金中的无序-有序相变，这是脆性的主要来源。具有不同化学计量比的模型合金已在三个温度（373、418和475 °C）下等温时效长达5000 h，并通过纳米压痕、原子探针断层扫描和透射电子显微镜进行表征。结果表明，非化学计量比合金表现出有序化，但在比化学计量比（Ni/Cr = 2.0）合金慢的速度。
Mechanical property degradation due to isothermal ageing is of potential concern for alloys based on the Ni–Cr binary system, such as Alloys 625 and 690. The disorder-order phase transformation, which is the primary source of embrittlement, has been studied in Ni–Cr model alloys by experimental approaches. Model alloys with different stoichiometries have been isothermally aged up to 5000 h at three temperatures (373, 418, and 475 °C) and characterized via nano-indentation, atom probe tomography, and transmission electron microscopy. Results show that off-stoichiometry alloys exhibit ordering but at a slower rate than stoichiometric (Ni/Cr = 2.0) alloy.